libmkv: Use uint64_t instead of UInt64.
libmkv: Use uint64_t instead of UInt64.

The rest of the code uses stdint types and this makes porting
easier.

Change-Id: Ie2f565f6a919199f0145b6aea97bb7588548e97d

pcwalton/libvpx,gshORTON/webm.libvpx,Laknot/libvpx,running770/libvpx,mbebenita/aom,matanbs/webm.libvpx,GrokImageCompression/aom,pcwalton/libvpx,ittiamvpx/libvpx,ittiamvpx/libvpx-1,mwgoldsmith/vpx,stewnorriss/libvpx,n4t/libvpx,shacklettbp/aom,thdav/aom,pcwalton/libvpx,shacklettbp/aom,shyamalschandra/libvpx,webmproject/libvpx,abwiz0086/webm.libvpx,ShiftMediaProject/libvpx,matanbs/webm.libvpx,ittiamvpx/libvpx-1,jmvalin/aom,felipebetancur/libvpx,jdm/libvpx,thdav/aom,Acidburn0zzz/webm.libvpx,felipebetancur/libvpx,liqianggao/libvpx,jacklicn/webm.libvpx,shyamalschandra/libvpx,lyx2014/libvpx_c,shareefalis/libvpx,thdav/aom,hsueceumd/test_hui,abwiz0086/webm.libvpx,jdm/libvpx,smarter/aom,shyamalschandra/libvpx,shareefalis/libvpx,Distrotech/libvpx,gshORTON/webm.libvpx,ittiamvpx/libvpx-1,WebRTC-Labs/libvpx,Acidburn0zzz/webm.libvpx,Maria1099/webm.libvpx,abwiz0086/webm.libvpx,liqianggao/libvpx,jacklicn/webm.libvpx,mbebenita/aom,gshORTON/webm.libvpx,jmvalin/aom,GrokImageCompression/aom,shareefalis/libvpx,smarter/aom,webmproject/libvpx,openpeer/libvpx_new,felipebetancur/libvpx,Suvarna1488/webm.libvpx,altogother/webm.libvpx,smarter/aom,Laknot/libvpx,GrokImageCompression/aom,webmproject/libvpx,VTCSecureLLC/libvpx,Suvarna1488/webm.libvpx,n4t/libvpx,kim42083/webm.libvpx,gshORTON/webm.libvpx,altogother/webm.libvpx,kalli123/webm.libvpx,jacklicn/webm.libvpx,Laknot/libvpx,lyx2014/libvpx_c,charup/https---github.com-webmproject-libvpx-,hsueceumd/test_hui,felipebetancur/libvpx,Distrotech/libvpx,Topopiccione/libvpx,luctrudeau/aom,shacklettbp/aom,jacklicn/webm.libvpx,goodleixiao/vpx,liqianggao/libvpx,webmproject/libvpx,abwiz0086/webm.libvpx,ittiamvpx/libvpx,GrokImageCompression/aom,kim42083/webm.libvpx,ShiftMediaProject/libvpx,shareefalis/libvpx,luctrudeau/aom,openpeer/libvpx_new,zofuthan/libvpx,Maria1099/webm.libvpx,hsueceumd/test_hui,liqianggao/libvpx,hsueceumd/test_hui,VTCSecureLLC/libvpx,mbebenita/aom,matanbs/vp982,mbebenita/aom,mwgoldsmith/libvpx,felipebetancur/libvpx,matanbs/webm.libvpx,kleopatra999/webm.libvpx,mwgoldsmith/vpx,stewnorriss/libvpx,Distrotech/libvpx,Laknot/libvpx,goodleixiao/vpx,pcwalton/libvpx,goodleixiao/vpx,Maria1099/webm.libvpx,kleopatra999/webm.libvpx,gshORTON/webm.libvpx,iniwf/webm.libvpx,VTCSecureLLC/libvpx,mwgoldsmith/libvpx,reimaginemedia/webm.libvpx,kleopatra999/webm.libvpx,Acidburn0zzz/webm.libvpx,Topopiccione/libvpx,ShiftMediaProject/libvpx,ittiamvpx/libvpx,stewnorriss/libvpx,running770/libvpx,reimaginemedia/webm.libvpx,openpeer/libvpx_new,thdav/aom,GrokImageCompression/aom,luctrudeau/aom,zofuthan/libvpx,altogother/webm.libvpx,ittiamvpx/libvpx,iniwf/webm.libvpx,matanbs/webm.libvpx,luctrudeau/aom,reimaginemedia/webm.libvpx,zofuthan/libvpx,hsueceumd/test_hui,Maria1099/webm.libvpx,Distrotech/libvpx,running770/libvpx,Acidburn0zzz/webm.libvpx,jdm/libvpx,iniwf/webm.libvpx,zofuthan/libvpx,thdav/aom,stewnorriss/libvpx,Laknot/libvpx,ittiamvpx/libvpx-1,charup/https---github.com-webmproject-libvpx-,reimaginemedia/webm.libvpx,shacklettbp/aom,thdav/aom,GrokImageCompression/aom,lyx2014/libvpx_c,WebRTC-Labs/libvpx,reimaginemedia/webm.libvpx,shareefalis/libvpx,altogother/webm.libvpx,Maria1099/webm.libvpx,matanbs/webm.libvpx,mbebenita/aom,felipebetancur/libvpx,WebRTC-Labs/libvpx,Suvarna1488/webm.libvpx,goodleixiao/vpx,liqianggao/libvpx,n4t/libvpx,Maria1099/webm.libvpx,shyamalschandra/libvpx,mwgoldsmith/libvpx,jmvalin/aom,altogother/webm.libvpx,mwgoldsmith/libvpx,charup/https---github.com-webmproject-libvpx-,mwgoldsmith/vpx,mbebenita/aom,Topopiccione/libvpx,VTCSecureLLC/libvpx,kim42083/webm.libvpx,luctrudeau/aom,jdm/libvpx,matanbs/vp982,Suvarna1488/webm.libvpx,jdm/libvpx,kleopatra999/webm.libvpx,zofuthan/libvpx,Acidburn0zzz/webm.libvpx,abwiz0086/webm.libvpx,iniwf/webm.libvpx,smarter/aom,kim42083/webm.libvpx,kim42083/webm.libvpx,openpeer/libvpx_new,matanbs/vp982,kalli123/webm.libvpx,VTCSecureLLC/libvpx,ShiftMediaProject/libvpx,Distrotech/libvpx,goodleixiao/vpx,Topopiccione/libvpx,jmvalin/aom,mwgoldsmith/libvpx,zofuthan/libvpx,webmproject/libvpx,mbebenita/aom,matanbs/webm.libvpx,kalli123/webm.libvpx,kim42083/webm.libvpx,Laknot/libvpx,jmvalin/aom,pcwalton/libvpx,mwgoldsmith/vpx,abwiz0086/webm.libvpx,openpeer/libvpx_new,kleopatra999/webm.libvpx,running770/libvpx,gshORTON/webm.libvpx,stewnorriss/libvpx,shyamalschandra/libvpx,jdm/libvpx,mbebenita/aom,ittiamvpx/libvpx-1,shyamalschandra/libvpx,ittiamvpx/libvpx,matanbs/vp982,charup/https---github.com-webmproject-libvpx-,jacklicn/webm.libvpx,reimaginemedia/webm.libvpx,matanbs/vp982,kalli123/webm.libvpx,stewnorriss/libvpx,jmvalin/aom,WebRTC-Labs/libvpx,ittiamvpx/libvpx-1,n4t/libvpx,charup/https---github.com-webmproject-libvpx-,iniwf/webm.libvpx,running770/libvpx,ittiamvpx/libvpx,pcwalton/libvpx,goodleixiao/vpx,smarter/aom,matanbs/vp982,running770/libvpx,webmproject/libvpx,hsueceumd/test_hui,ShiftMediaProject/libvpx,Acidburn0zzz/webm.libvpx,shareefalis/libvpx,luctrudeau/aom,mwgoldsmith/libvpx,smarter/aom,iniwf/webm.libvpx,n4t/libvpx,shacklettbp/aom,Suvarna1488/webm.libvpx,mwgoldsmith/vpx,mbebenita/aom,matanbs/vp982,lyx2014/libvpx_c,openpeer/libvpx_new,kalli123/webm.libvpx,VTCSecureLLC/libvpx,Topopiccione/libvpx,WebRTC-Labs/libvpx,lyx2014/libvpx_c,Distrotech/libvpx,Topopiccione/libvpx,mwgoldsmith/vpx,lyx2014/libvpx_c,liqianggao/libvpx,altogother/webm.libvpx,charup/https---github.com-webmproject-libvpx-,kalli123/webm.libvpx,Suvarna1488/webm.libvpx,kleopatra999/webm.libvpx,shacklettbp/aom,jacklicn/webm.libvpx